The Mongrel Horde was the original concept for Warlords of Draenor.
It was originally going to be about Garrosh taking all the “Lowbie Enemy Races” and making a new Horde with them.
They would have had:
Murlocs
Troggs
Kobolds
Quillboars
Gnolls
Centaurs
(I bet they would have called that expansion “Warlords of the Barrens” lol)
Did you notice that from that list only Gnolls and Centaurs are yet to receive updated Models?
My theory is that they are slowly updating all those Races so that when they get all of them at HD quality they can release a content patch where we fight the Mongrel Horde sans Garrosh.
I added a funny image to the OP, just to make it funny.
*The meaning of “funny”, hereinafter referred to as “the word”, is wholly defined by Mortis. Any attempt to discover the definition of the word will result in Chaos Bolts. Any attempt to define the word will result in Chaos Bolts. Any complaints about the humorous content of the image will result in Chaos Bolts. Any Demon Hunter presence will result in devastating retaliatory Chaos Bolts.
The concept of lowby mobs joining together to get us is much better than WoD’s time travel nonsense, but they couldn’t find a reason why Garrosh would ever recruit those races to his Horde instead of more Orcs.